copperas

play
noun cop·per·as \ ˈkä-p(ə-)rəs \

Definition of copperas

Origin and Etymology of copperas

Middle English coperas, from Anglo-French coperose, from Medieval Latin cuprosa, probably from aqua cuprosa, literally, copper water, from Late Latin cuprum


Medical Dictionary

copperas

play
noun cop·per·as \ ˈkäp-(ə-)rəs \

medical Definition of copperas

:a green hydrated ferrous sulfate FeSO4·7H2O used especially in making inks and pigments used especially of commercial grades not to be used internally

Seen and Heard

What made you want to look up copperas? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to curse or denounce

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!